Conveners
Strong electromagnetic and gravitational field physics: From laboratories to early Universe: Strong electromagnetic and gravitational field physics: from laboratories to early Universe
- Ehsan Bavarsad (Department of Physics, University of Kashan, 8731753153, Kashan, Iran)
- She-Sheng Xue (ICRANet, Physics Department, Sapienza University of Rome)
Strong electromagnetic and gravitational field physics: From laboratories to early Universe: Strong electromagnetic and gravitational field physics: from laboratories to early Universe
- There are no conveners in this block
Description
Strong electromagnetic and gravitational fields play important roles in physics, particularly in astrophysics and cosmology. Strong electromagnetic and gravitational fields are two of the most important ingredients of the compact objects and the early universe. This session is dedicated to all theoretical aspects of high field and/or energetic phenomena due to strong electromagnetic fields and/or gravity in Earth-based laboratories as well as astrophysics and cosmology, such as Schwinger pair creation in Minkowski spacetime and curved spacetimes, Gibbons-Hawking radiation, backreaction effects, magnetogenesis, charged particle acceleration, vacuum polarization, and nonlinearity of strong electromagnetic fields. It is also dedicated to experimental and theoretical aspects of laboratory astrophysics and astrophysical observations related to strong field physics, such as intense lasers plasma acceleration, plasma interaction with strong electromagnetic fields, radiation from accelerating charges, observation of birefringence in neutron stars, simulation of strong gravity effects etc.
Phenomenological studies in the last few years have provided significant support to the idea that the vacuum energy density (VED) is a running quantity with the cosmological evolution. Such a running actually helps in alleviating the cosmological tensions afflicting the ΛCDM. The theoretical studies backing up this approach go under the name of "running vacuum model" (RVM). Using this...
In this talk I will firstly review the Schwinger effect in charged black holes and then introduce a remarkable alternative approach by using the monodromy. The explicit elaboration of monodromy and the model calculations seem to reveal evidences that the monodromy can provide a practical technique to study the spontaneous pair production in general black holes and electromagnetic fields.
The adiabatic regularization method is likely the most direct and intuitive subtraction scheme for FLRW cosmologies. The method requires one to start with a nonvanishing mass, but massless theories can be studied by taking the massless limit at the end of the calculations. In fact, the conformal anomaly for scalar fields was first derived with the adiabatic method by taking the massless limit....
Similar to Dirac models of nanostructures, low-energy excitations in spin systems --magnons-- can be described in terms of effective field theories. The theory describing antiferromagnets can be mapped into scalar massless electrodynamics with an external electromagnetic potential. Here, we consider the case of a constant inhomogeneous magnetic field applied to an antiferromagnet, whose...
That light propagating in a gravitational field gets
frequency-shifted is one of the basic consequences of any metric theory
of gravity rooted in the equivalence principle. At the same time, also a
time dependent material's refractive index can frequency-shift light
propagating in it. The mathematical analogy between the two effects is
such that the latter has been used to study the...
When charged fermions gyrate within a uniform magnetic field, their energy undergoes quantization into discrete levels known as Landau levels, a phenomenon termed Landau quantization. This effect finds diverse applications, ranging from the quantum Hall effect and the de Haas Van Alphen effect to the formation of super-Chandrasekhar white dwarfs. In a uniform magnetic field, Landau levels...
The gravitational memory effect and its electromagnetic (EM) analog are potential probes in the strong gravity regime. In the literature, this effect is derived for static observers at asymptotic infinity. While this is a physically consistent approach, it restricts the spacetime geometries for which one can obtain the EM memory effect. To circumvent this, we evaluate the EM memory effect for...
There are several quantum phenomena that can be described in a semiclassical approach, such as the Hawking effect, Schwinger pair production and the Casimir effect.
In this talk we will focus on the role of resummations in this framework, which are necessary if one wants to access the nonperturbative regime. We will give a general overview of results valid for quantum fields in curved...
The aim of this study is to explore some features of the nonperturbative, one-loop, regularized effective Lagrangian of scalar quantum electrodynamics (QED) in a uniform electric field background with constant energy density in the Poincare patch of 2-dimensional de Sitter spacetime ($\mathrm{dS}_{2}$). Particularly, the electric permittivity of the vacuum, and the equation of state of the...
